feat(router): Add payments get-intent API for v2

[AnuthaDev]

Type of Change

• Bugfix
• New feature
• Enhancement
• Refactoring
• Dependency updates
• Documentation
• CI/CD

Description

Added get-intent API for payments

Additional Changes

• This PR modifies the API contract
• This PR modifies the database schema
• This PR modifies application configuration/environment variables

Motivation and Context

Closes #6395

How did you test it?

1a. Request

curl --location 'http://localhost:8080/v2/payments/12345_pay_0192b3a0145173519abaa04d4b939558/get-intent' \
--header 'Content-Type: application/json' \
--header 'X-Profile-Id: pro_wcilqiS8axGFvpzfO9pw' \
--header 'api-key: dev_D3bTAROAIoP4nlqsaQXLzXoLdZznkpWQ3l4mzMRJEAP7V46pSnZucJM2zQiVwG0J'

1b. Response

{
    "id": "12345_pay_0192b3a0145173519abaa04d4b939558",
    "amount_details": {
        "order_amount": {
            "Value": 100
        },
        "currency": "USD",
        "shipping_cost": null,
        "order_tax_amount": null,
        "skip_external_tax_calculation": "Skip",
        "skip_surcharge_calculation": "Skip",
        "surcharge_amount": null,
        "tax_on_surcharge": null
    },
    "client_secret": "12345_pay_0192b3a0145173519abaa04d4b939558_secret_0192b3a0145173519abaa05c07ec3e61",
    "merchant_reference_id": null,
    "routing_algorithm_id": null,
    "capture_method": "automatic",
    "authentication_type": "no_three_ds",
    "billing": null,
    "shipping": null,
    "customer_id": null,
    "customer_present": "Present",
    "description": null,
    "return_url": null,
    "setup_future_usage": "on_session",
    "apply_mit_exemption": "Skip",
    "statement_descriptor": null,
    "order_details": null,
    "allowed_payment_method_types": null,
    "metadata": null,
    "connector_metadata": null,
    "feature_metadata": null,
    "payment_link_enabled": "Skip",
    "payment_link_config": null,
    "request_incremental_authorization": "default",
    "expires_on": "2024-10-22T10:02:45.618Z",
    "frm_metadata": null,
    "request_external_three_ds_authentication": "Skip"
}

Checklist

• I formatted the code cargo +nightly fmt --all
• I addressed lints thrown by cargo clippy
• I reviewed the submitted code
• I added unit tests for my changes where possible

[semanticdiff-com]

Review changes with SemanticDiff.

Analyzed 17 of 18 files.

Overall, the semantic diff is 50% smaller than the GitHub diff.

	Filename	Status
✔️	crates/router_env/src/logger/types.rs	Analyzed
✔️	crates/router/src/types/api/payments.rs	49.02% smaller
✔️	crates/router/src/services/api.rs	Analyzed
✔️	crates/router/src/routes/app.rs	16.0% smaller
✔️	crates/router/src/routes/lock_utils.rs	37.84% smaller
✔️	crates/router/src/routes/payments.rs	Analyzed
✔️	crates/router/src/core/payments.rs	6.67% smaller
✔️	crates/router/src/core/payments/operations.rs	Analyzed
✔️	crates/router/src/core/payments/transformers.rs	Analyzed
✔️	crates/router/src/core/payments/operations/payment_get_intent.rs	Analyzed
✔️	crates/openapi/src/openapi_v2.rs	18.63% smaller
✔️	crates/openapi/src/routes/payments.rs	Analyzed
✔️	crates/hyperswitch_domain_models/src/router_flow_types/payments.rs	44.35% smaller
✔️	crates/api_models/src/payments.rs	Analyzed
✔️	crates/api_models/src/events/payment.rs	32.86% smaller
✔️	api-reference-v2/mint.json	Analyzed
✔️	api-reference-v2/openapi_spec.json	88.83% smaller
❔	api-reference-v2/api-reference/payments/payments--get-intent.mdx	Unsupported file format